Got an 03 Cobra Rad, or should I hold out for a Fluidyne??

Why even ask? You've already got it, it's a freebie ... make it work! If you can't rig it up to fit in any way at all - which I doubt, since it's pretty easy to fit just about any radiator in a Fox, if you're using an electric fan - then just plop in your original and then look into a Fluidyne. You'll be out, what, a few hours' time and not much else...?

You could always just give it to me, of course, if you don't want it...